A friend of mine has taken on the task of finding replacement AC adapters for two laptops, and I thought that I could repair the broken cord on one. But I tried to take the brick apart and damaged it beyond economical repair, so I resorted to the ‘Net to find replacements. He gave me
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There seem to be a zillion pitfalls out there just waiting to entrap the unwary buyer. Take for instance my dilemma. The bozo at work borrowed the Brother P-Touch labeler and brought it back without the AC adapter – apparently he lost it. So we put eight AA cells in the battery holder and it
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Wanna Make A Garage Door Open Alarm This is a continuation of my previous blog. I could use two 555 timer chips in the astable mode to generate a European type siren with the high-low ‘warble’ tones, but I decided I would do it with a couple transistors. Actually I coul+d use a single 556
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This light deactivated alarm (or should it be called a dark activated alarm?) might be used as a detector when a light beam is broken. I would use a red LED and restrict the light to a narrow beam so that it would be hard to see. When the CdS cell is illuminated and the
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